c1873d84a3
When linking a big-endian image for Arm, clang has to select between BE8 and BE32 formats. The default is dependent on the selected target architecture. For ARMv6 and later architectures the default is BE8, for older architectures the default is BE32. For BE8 and BE32, compiler outputs a big endian ELF relocatable object file with the instructions and data both big endian. The difference is that at link time, for BE8 a linker must endian reverse the instructions to little endian. For BE8, the clang has to pass --be8 to the linker for Arm. At the moment clang is not passing the --be8 flag to linker for the baremetal target architectures above ArmV6 for Arm. This patch passes through --be8 and -BE or EL to the linker, taking into account the target and the -mbig-endian and -mlittle-endian flag. Also there are few more changes in the baremetal driver so that the code can cope with AArch64 being big-endian as well. Reviewed By: michaelplatings, MaskRay Differential Revision: https://reviews.llvm.org/D154786
85 lines
3.3 KiB
C++
85 lines
3.3 KiB
C++
//===--- ARM.h - ARM-specific (not AArch64) Tool Helpers --------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_ARCH_ARM_H
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#define LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_ARCH_ARM_H
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#include "clang/Driver/ToolChain.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Option/Option.h"
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#include "llvm/TargetParser/ARMTargetParser.h"
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#include "llvm/TargetParser/Triple.h"
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#include <string>
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#include <vector>
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namespace clang {
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namespace driver {
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namespace tools {
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namespace arm {
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std::string getARMTargetCPU(StringRef CPU, llvm::StringRef Arch,
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const llvm::Triple &Triple);
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std::string getARMArch(llvm::StringRef Arch, const llvm::Triple &Triple);
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StringRef getARMCPUForMArch(llvm::StringRef Arch, const llvm::Triple &Triple);
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llvm::ARM::ArchKind getLLVMArchKindForARM(StringRef CPU, StringRef Arch,
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const llvm::Triple &Triple);
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StringRef getLLVMArchSuffixForARM(llvm::StringRef CPU, llvm::StringRef Arch,
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const llvm::Triple &Triple);
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void appendBE8LinkFlag(const llvm::opt::ArgList &Args,
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llvm::opt::ArgStringList &CmdArgs,
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const llvm::Triple &Triple);
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enum class ReadTPMode {
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Invalid,
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Soft,
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TPIDRURW,
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TPIDRURO,
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TPIDRPRW,
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};
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enum class FloatABI {
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Invalid,
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Soft,
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SoftFP,
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Hard,
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};
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FloatABI getDefaultFloatABI(const llvm::Triple &Triple);
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FloatABI getARMFloatABI(const ToolChain &TC, const llvm::opt::ArgList &Args);
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FloatABI getARMFloatABI(const Driver &D, const llvm::Triple &Triple,
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const llvm::opt::ArgList &Args);
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void setFloatABIInTriple(const Driver &D, const llvm::opt::ArgList &Args,
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llvm::Triple &triple);
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bool isHardTPSupported(const llvm::Triple &Triple);
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ReadTPMode getReadTPMode(const Driver &D, const llvm::opt::ArgList &Args,
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const llvm::Triple &Triple, bool ForAS);
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void setArchNameInTriple(const Driver &D, const llvm::opt::ArgList &Args,
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types::ID InputType, llvm::Triple &Triple);
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bool useAAPCSForMachO(const llvm::Triple &T);
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void getARMArchCPUFromArgs(const llvm::opt::ArgList &Args,
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llvm::StringRef &Arch, llvm::StringRef &CPU,
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bool FromAs = false);
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llvm::ARM::FPUKind getARMTargetFeatures(const Driver &D,
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const llvm::Triple &Triple,
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const llvm::opt::ArgList &Args,
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std::vector<llvm::StringRef> &Features,
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bool ForAS, bool ForMultilib = false);
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int getARMSubArchVersionNumber(const llvm::Triple &Triple);
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bool isARMMProfile(const llvm::Triple &Triple);
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bool isARMAProfile(const llvm::Triple &Triple);
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bool isARMBigEndian(const llvm::Triple &Triple, const llvm::opt::ArgList &Args);
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} // end namespace arm
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} // end namespace tools
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} // end namespace driver
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} // end namespace clang
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#endif // LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_ARCH_ARM_H
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